ECAT Chemistry Basic Concepts Test Online

Chemistry Basic Concepts MCQS Online Test

ECAT Chemistry Basic Concepts Chapter Online Test

Total Questions: 71
Time Allowed: 30 Minutes
Total Marks: 71
How to Attempt Test: Please choose the right Option in MCQ-type question.
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ECAT Chemistry Basic Concepts Test

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1. Indicate the incorrect statement form the following

2. Which of the following method is used to estimate oxygen in an organic compound?

3. How many moles of Helium gas occupy 22.4 L at 0°C at 1 atm. Pressure?

4. Which of the following represents a compound?

5. An anhydrous salt of copper is found to contain 52.7% chlorine and 47.3% copper by mass. What is the empirical formula for this salt?

6. Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of

7. Ayesha required an aqueous solution of sodium chloride. She made the solution by dissolving salt in:

8. The volume occupied by 28 gram of N₂ at STP?

9. Which of the following is an element?

10. What are the ratios among the volumes of gases of ³²O₂,²H₂, and ¹⁶CH₄ if equal mass of each gas is taken?

11. A gaseous mixture contains 50% helium and 50% methane by volume. What is the percent by weight of methane in the mixture?

12. How many elements are present in two molecules of aspirin? The formula for aspirin is C₉H₈O₄.

13. What are the two different types of ions?

14. Which of the following is a pure substance made up of two or more types of atoms or elements?

15. The set of numerical coefficients that balances the chemical equation K₂CrO₄ + CH1 → K₂Cr₂O₇ + KC1 + H₂O

16. The Number of oxygen atoms in 4.4 g of CO2 is approximately

17. How will you separate a mixture of two gases?

18. How many moles of CO₂ are present in 220 mg?

19. For which of the following terms empirical formula cannot be applied?

20. The hydrogen phosphate of certain metal has formula MHPO₄. The formula of metal chloride would be

21. Which of the following could be an empirical formula?

22. Isotopes differ in the

23. Percent of calcium in calcium carbonate is

24. Balance the following equation using minimum integral coefficients: (NH₃ + O₂ → NO₂ + H₂O) Find the stoichiometric coefficient for oxygen gas O₂:

25. To differentiate between C-12, C-13 and C-14, the instrument that you would use is


 

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22 Comments

  1. The relative atomic mass of chlorine is 35.5. What is the mass of 2 moles of chlorine gas?
    chlorine gas has 2 atom so, the mass of two moles of chlorine gas is 142 not 71

    1. Sir please ap bta skty Hain k ma apni entry test ki tyari Ghar ma rah kr kis tareeky say kr skti ho. Please guide me

  2. A few questions don’t make any sense with their choices, not to mention that broken/wrong answers to them are also there. For instance, the question where 2 moles of Cl2 gas are asked. The answer is 142g however the answer, set by the creator of these tests, is 71g. Apart from that, the test is quite helpful.

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